Graphical user interface for a display screen



The sole FIGURE is a front view of a graphical user interface for a display screen.

The claimed design includes the solid black lines and does not include the negative space. The outermost broken line showing a portion of a display screen is for the purpose of illustrating environmental structure and forms no part of the claimed design. The broken lines showing portions of the graphical user interface form no part of the claimed design. 

We claim the ornamental design for a graphical user interface for a display screen, as shown and described. 